Light Follower Robot

DREAMERS

LUMOS A LIGHT FOLLOWER ROBOT INTRODUCTION Light follower robot is a specially desiged !obile robot which iitiates by the itesity of light" It is capable of detectig ad foll follo owig wig the lig ight ht so#r so#rce ce o the the tra$ tra$el elli lig g path" ath" It ca ca be desiged with or witho#t a !icrocotroller" This pro%ect is doe by #sig a !icrocotroller" The applicatios of Light &ollowig Robot is #p to o#r i!agiatio" It co#ld be a robot which seds yo# a !essage to yo#r cell phoe whe it detects light i yo#r ho#se which sho#ld be o'"

(RO)ECT Co!poets Re*#ired+ ," -" ." /" 0" 1"

Ard#io Ard#io !icrocotr !icrocotroller oller LDR LDR ses sesors ors Resis esisto tors rs Coect Coectig ig wires wires Tyres yres Cotio#s Cotio#s rotatio rotatio ser$os

Ard#io is a sigle board !icrocotroller" It is a ope so#rce electroics prototypig platfor! based o 2e3ible4 easy to #se hardware ad software" LDRs or Light Depedet Resistors are #sed for a co#ple of light sesig applicatios" It is !ade fro! high resistace se!icod#ctor ad are #sed i !ay light or dar5 sesig circ#its"

DREAMERS

6ere i this light followig robot we are #sig three LDR sesors to detect the light co!ig fro! the right4 left ad frot side of the robot so that it ca !o$e accordigly" (rogra! the robot s#ch that it ca detect the light of high itesity ad let it !o$e towards that regio"  The !ai tas5 is to read o#t the sesor readigs ad co!parig it" The followig 2ow chart represets the abo$e !etioed tas5"

DREAMERS

Ard#io code for light followig robot is as follows+

 //--- Library  7icl#de  //--- Pin Defnitions 7de8e LE&TSER9O(IN .  //The digital pin that the let servo is connected to 7de8e RI:6TSER9O(IN ,,  //The digital pin that the right servo is connected to 7de8e LE&TLI:6TSENSOR ;  //The analog pin the let light sensor is connected to 7de8e RI:6TLI:6TSENSOR , //The analog pin the right light sensor is connected to 7de8e MIDLI:6TSENSOR -  //The analog pin the mid light sensor is connected to  //--- Servo Setup Ser$o leftSer$o; Ser$o rightSer$o ;  //--- Speed Setup int robotSpeed = <0;  //set the speed o the robot  int right Speed = 0;; int leftSpeed = 0;;  //--- Sensor Values int leftLightSesor9al = ;; int  rightLightSesor9al = ;; int !idLightSesor9al = ;>  //--- Delay Threshold int delay(ara! = ,;;  //--- The program setup void setup! " Serial.begi?1;;!;  //Starts the serial port robotSet#p!;

#  //--- The main program code void $oop! "  //--- Get inormation rom the light sensor

DREAMERS leftLightSesor9al = aalogReadLE&TLI:6TSENSOR!; rightLightSesor9al = aalogReadRI:6TLI:6TSENSOR!; !idLightSesor9al = aalogReadMIDLI:6TSENSOR!; if@leftLightSesor9al  rightLightSesor9al BB leftLightSesor9al  !idLightSesor9al    goLeft@>   delay@0;;>  Else if@rightLightSesor9al  leftLightSesor9al BB rightLightSesor9al  !idLightSesor9al    goRight@>   delay@0;;>  Else if@!idLightSesor9al  rightLightSesor9al BB !idLightSesor9al  leftLightSesor9al    go&orward@>   delay@0;;> 

void %o&otSetup! " setSpeedrobotSpeed !; piModeLE&TSER9O(IN' OUT(UT!; piModeRI:6TSER9O(IN ' OUT(UT!; leftSer$o.attachLE&TSER9O(IN!; rightSer$o.attachRI:6TSER9O(IN !; goStop!; # void setSpeedint ewSpeed! " setSpeedLeftewSpeed!; setSpeedRightewSpeed!; # void setSpeedLe(tint ewSpeed! " i(ewSpeed >= ,;;! "ewSpeed = ,;;;# i(ewSpeed <= ;! "ewSpeed = ;;# leftSpeed = ewSpeed ) ;"?; #

DREAMERS

void setSpeedRi*+tint ewSpeed! " i(ewSpeed >= ,;;! "ewSpeed = ,;;;# i(ewSpeed <= ;! "ewSpeed = ;;# rightSpeed = ewSpeed ) ;"?; # void *oFo%,-%d! " leftSer$o.write ?;  leftSpeed!; rightSer$o.write ?; / rightSpeed!; #  //--- ove the robot bac!"ard void *oB-01,-%d! " leftSer$o.write ?; / leftSpeed!; rightSer$o.write ?;  rightSpeed!; #  //--- ove the robot right  void *oRi*+t! " leftSer$o.write ?;  leftSpeed!; rightSer$o.write ?;  rightSpeed!; #  //--- ove the robot let  void *oLe(t! " leftSer$o.write ?; / leftSpeed!; rightSer$o.write ?; / rightSpeed!; #  //--- Stop the robot  void *oStop! " leftSer$o.write ?;!; rightSer$o.write ?;!; #

CONCLUSION

DREAMERS

 The pro%ect was s#ccessf#l" The Light &ollower was capable eo#gh to detect the light ad !o$e accordigly"